2-(4-Chloro-6-isopropoxy-1,3,5-triazin-2-ylamino)-5-(1-ethyl-2-hydroxy-5-sulfomethyl-4-methyl-6-oxo-1,6-dihydropyridin-3-ylazo)-1,4-benzenedisulfonic acid trisodium salt

trisodium 2-[[4-chloro-6-(1-methylethoxy)-1,3,5-triazin-2-yl]amino]-5-[[1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-5-(sulphonatomethyl)-3-pyridyl]azo]benzene-1,4-disulphonate